Answers created by Truong-Son N.

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• How do you calculate the ionization energy of He+?
  
• Which elements have #d# orbitals?
  
• What is the specific heat of the unknown metal sample?
  
• What is the enthalpy change for an isothermal process?
  
• What is the total energy needed to see all 15 spectral lines for the electronic transitions involving #n = 1# up to and including #n = 6#, assuming every transition occurs only once? What wavelength is needed to cause this in angstroms?
  
• Can an acid base reaction be at equilibrium?
  
• How to treat stretch bond to calculate its enthalpy and entropy contribution?
  
• What is the atomic mass of Uranium?
  
• Schrodinger equation in 1 dimension Question details in the image?
  
• On addition of #NaOH# to #CH_3COOH# solution, #60%# of the acid is neutralised. If #pK_a# of #CH_3COOH# is 4.7 then the pH of the resulting solution will be?
  
• Is power related to work and time?
  
• 1.00kj of energy transferred as heat to O2, external pressure is 2.00atm. O2 expands from 1.00L to 3.00L against this constant pressure. Calculate w and change in internal energy (delta U) when O2 is ideal gas?
  
• How do you use the equipartition theorem to predict the average kinetic energy of one molecule?
  
• What is the lattice enthalpy of #"MgCl"_2# and how do you determine it using the Born-Haber cycle?
  
• Which of the following Ka values represents the acid with the strongest conjugate base?
  
• Are the last 10 electrons in nickel the #3d# electrons?
  
• Why change in dipole moment or fluctuating dipole moment is necessary for absorption of infrared radiation?
  
• If #"0.1000 g"# of #"CO"_2# seeps into initially #"0.1026 M"# #"NaOH"# to degrade it, and the student has #"0.1142 M"# #"HCl"#, what volume of #"HCl"# is needed to neutralize #"NaOH"#? What if no #"CO"_2# seeped in? What volume then?
  
• Calculate the limiting value of the fraction of dissociation (α) of a weak acid (pKa = 5.00) as the concentration of HA approaches 0. Repeat the same calculation for pKa = 9.00.?
  
• Titration curve? Please help...
  
• How is francium metal oxidized by oxygen gas or by chlorine gas?
  
• Why the graph of V-T when drawn,is put as dotted line near the origin?
  
• Please show the mechanism of Oxymercuration - demercuration ? Give an example to make it understand.
  
• Please Help - More Trouble with Phase Changes?
  
• Question #29c2d
  
• PROVE that benzene, #"NO"_3^(-)#, and #"CO"_3^(2-)# have resonance??
  
• Derive the charge to mass ratio (#e//m#) for an electron?
  
• Out of the given atoms which atom have the highest energy of 2s-subshell? A) H ,B) Li ,C) Na
  
• Being given the structure of hemoglobin, determine the hybridization state of the iron atom?
  
• How do we know that the atomic orbital angular momentum magnitude is #sqrt(l(l+1))ℏ#, where #ℏ = h//2pi#?
  
• Can we treat stretch mode in vibrational analysis as Harmonic oscillator?
  
• Consider Hydrogen ion in a box having one dimension, then find electron probability distribution?
  
• Assuming 100% dissociation, calculate the freezing point and boiling point of 2.50m K3PO4?
  
• Why is q positive in an isothermal expansion?
  
• Feasibility of titration of #"2.5 mmols HY"# (#"pK"_a = 7.00#) using #"0.1 mmol/mL"# #"NaOH"#?
  
• Does a high +∆G mean that the reaction is irreversible (and equilibrium cannot be attained) or that the reaction lies to the right?
  
• How an atom will look like with all atomic orbitals around it's nucleus?
  
• What quantum number defines a subshell? How do we label each subshell? How many orbitals in each subshell?
  
• Consider the following quantum numbers sets; determine if they can occur together to specify an orbital. If not indicate which rule has been violated?
  
• How many total orbitals in shell n=4? What is the relationship between the total number of shell and the quantum number n for that shell?
  
• Which relaxation transition is possible, #3s->2p# in sodium or #3p -> 2s# in chlorine?
  
• What is the molar mass of cholesterol if 0.438 mol weighs 169.37 g? Hint: What is the definition of molar mass?
  
• What is the Gibbs free energy of formation of methane at 298 K, using the given information?
  
• What is the reaction of calcium carbonate with sufficient hydrochloric acid?
  
• Will a solution of #H_2SO_4//SO_4^(2-)# be a buffer? Why or why not?
  
• Why don't pure solids or liquids shift equilibrium?
  
• How do you estimate the average kinetic energy of #"2 mols"# of #"O"_2# gas at #"298 K"#?
  
• Calculate the ratio of total aspirin concentration (#"HAsp" + "Asp"^(-)#) on the L/R side of a membrane between blood plasma and the stomach, if #["HAsp"]# is the same on each side of the membrane? The stomach #"pH"# is #1.00# and blood #"pH"# is #7.4#.
  
• Can you represent the universal gas constant in units of #"mL"cdot"atm/mol"cdot"K"#?
  
• How many grams of sucrose should be dissolved in 100 g water in order to produce a solution with a 105°C difference between freezing point and boiling point temperatures? (M.Wt sucrose = 342, Kb=0.51, Kf=1.86)
  
• Help me understand the de Broglie equation??
  
• Question #2943c
  
• Question #ef5d9
  
• Write out the symmetry elements and operators for cyclopentane, and determine its point group?
  
• Which one is more dangerous, alpha particles or beta particles?
  
• How is CO2 the reactant in excess in this problem?
  
• A 0.0182 g sample of an unknown substance was dissolved in 2.135 g of benzene. The molality of the solution as determined by freezing-point depression was 0.0698. What is the molecular weight of the unknown substance?
  
• When glucose undergoes fermentation, ethanol and carbon dioxide are formed. #"C"_6"H"_12"O"_6 -> 2"C"_2"H"_5"OH" + 2"CO"_2#. Calculate the mass of ethanol that could be obtained from 25 g of glucose?
  
• Balance the redox equation occurring in acidic solution. #H^+(aq)+Cr(s)-> H_2(g)+Cr^(3+)(aq)#? Please help, thanks.
  
• What is the dipole moment of an atom?
  
• How many orbitals do you think exist in a atom?
  
• The coefficient of linear expansion of iron is 0.000011 /k. An iron rod is 10 m long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to ?
  
• Explain why the entropy increased when the enzyme binds to the substrate? I thought binding to the substrate would reduce the entropy because it is more ordered?
  
• For the rate law, #"rate" = k[A]^2[B]#, how do concentrations function when finding the units of the rate constant?
  
• How do I calculate Kp for C+CO2=2CO given the following reactions? C+2H2O=CO2+2H2 and H2+CO2=H2O+CO.
  
• Can someone please double check if I have oxidised the number of sulfur correctly for the following ions? The question is in the description box below.
  
• What percent of #"HIn"# (#"pH"# range of #2.60#) is in the buffer solution in order to see only the acidic color of the indicator, if the acid-base ratio to see the acidic color is equal to the base-acid ratio to see the basic color?
  
• What does it mean that the electron affinity of fluorine is less than that of chlorine? Is this unusual?
  
• An electron traveling at #5.6 xx 10^5 "m/s"# has an uncertainty in its velocity of #2.64 xx 10^(5) "m/s"#. What is the uncertainty in its position?
  
• Why is #e# the charge of the electron?
  
• What is the maximum #["CO"_3^(2-)]# that can exist in a saturated solution of AgBr?
  
• In an aqueous solution containing #"1.0 M"# #"NH"_4"Cl"# (#K_a = 5.56 xx 10^(-10)#), what is the solubility of #"Mg"("OH")_2#? #K_(sp) = 5.5 xx 10^(-11)#.
  
• A 100-gram sample of #H_2O(l)# at 22.0°C absorbs 8360 joules of heat. What will be the final temperature of the wild?
  
• Find the #"pH"# in each of the following scenarios? #"pK"_a = 3.36# for #"HNO"_2#.
  
• What is the initial concentration of the conjugate base of a weak monoprotic acid whose #"pK"_a# is #4.30# if the #"pH"# is #8.30#?
  
• What oxidation state does #"Cr"# have in #"CrO"_5#?
  
• If #"NaOH"(aq)# that was originally #"0.300 M"# is left exposed to the air and #"0.0200 M"# of #"CO"_2# dissolves in the solution, but right at that point the student catches his mistake and caps the #"NaOH"#, what is its new molarity?
  
• Why can we not figure out the number of valence electrons in transition metals?
  
• A certain amount of #"BOH"# and #"BCl"# were mixed to make a #"200-mL"# buffer with #"pH" = 10.00#. If #"0.060 mols"# of #"HCl"# was added into the buffer and it results in a buffer #"pH"# of #9.00#, what was each concentration before adding acid?
  
• How do you draw the Lewis structure for the hypobromite ion, #BrO^-#?
  
• Find the de broglie wavelength of hydrogen atom at a temperature 303 K?
  
• How do you find the integrated rate law for a first-order reaction?
  
• How can I make the degree sign ? I can't find it on the signs>_<
  
• Calculate the percentage by mass of each element in the following compound?
  
• What is the standard entropy of the reaction below at 25 degrees Celsius? H2O(g) + C (graphite, s) --> H2(g) + CO(g)
  
• Using the following thermochemical data, calculate ΔHf° of Yb2O3(s)?
  
• What is the final temperature of both the weight and the water at thermal equilibrium? Express the temperature in Celsius to three significant figures.
  
• What are the differences between primary, secondary, and tertiary substitution?
  
• How can we prove that #|m_l| <= l#, i.e. that the magnetic quantum number can be no bigger than #l#, and no more negative than #-l#?
  
• From where do the properties of the magnetic quantum number #m_l# originate?
  
• What is the wavelength of light emitted when a bromine valence electron relaxes down to #n = 1#?
  
• An atom contains a total of 25 electrons. When the atom is in the ground state, how many different principal energy levels will contain electrons?
  
• How do I do titration calculations to get acid concentration?
  
• Describe sulfur in its elemental state?
  
• How does a symmetric probability density relate to a molecular bonding orbital in hydrogen atom and its bonding potential energy curve? Is there such a thing as an antibonding potential energy curve?
  
• What mass of AgBrO3 can be dissolved in 50.0 mL of 0.500M NaBrO3 at 80°C?
  
• How to Calculate the Number of Tin Atoms in a Can?
  
• Question #964eb
  
• Where are magnesium, argon, copper, and silicon on the periodic table?
  
• What is the standard enthalpy of formation of SO2(g)?
  
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